<template>
    <div>
      <!--      面包导航-->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>
<!--      卡片视图区域-->
      <el-card>
<!--        头部警告区域-->
        <el-alert
          title="注意：只允许为第三级分类设置相关参数"
          type="warning"
          :closable="false"
          show-icon>
        </el-alert>
<!--        选择商品分类区域-->
        <el-row class="cat_opt">
          <el-col>
            <span>选择商品分类：</span>
<!--            选择商品分类的级联选择框-->
            <el-cascader
              v-model="selectedCateKeys"
              :options="catalist"
              :props="cateProps"
              @change="handleChange"></el-cascader>
          </el-col>
        </el-row>
<!--        tab页签区域-->
        <el-tabs v-model="activeName" @tab-click="handleClick">
<!--          添加动态参数面板-->
          <el-tab-pane label="动态参数" name="many">
<!--            添加参数按钮-->
            <el-button @click="addDialogVisiable=true" size="mini" type="primary" :disabled="isBtnDisabled">添加参数</el-button>
<!--            动态参数表格-->
            <el-table :data="manyTableData" border stripe>
<!--              展开行-->
              <el-table-column type="expand">
                <template slot-scope="scope">
<!--                  作用域插槽-->
                  <el-tag @close="handleClose(i,scope.row)" closable v-for="(item,i) in scope.row.attr_vals" :key="i">
                    {{item}}
                  </el-tag>
<!--                  循环渲染tag标签-->
<!--                  输入文本框-->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
<!--                  添加按钮-->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!--              索引列-->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button @click="showEditDialog(scope.row.attr_id)" size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                  <el-button @click="removeParams(scope.row.attr_id)" size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
<!--          添加静态属性的面板-->
          <el-tab-pane label="静态属性" name="only">
            <el-button @click="addDialogVisiable=true" size="mini" type="primary" :disabled="isBtnDisabled">添加属性</el-button>
<!--            静态属性表格-->
            <el-table :data="onlyTableData" border stripe>
              <!--              展开行-->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!--                  作用域插槽-->
                  <el-tag @close="handleClose(i,scope.row)" closable v-for="(item,i) in scope.row.attr_vals" :key="i">
                    {{item}}
                  </el-tag>
                  <!--                  循环渲染tag标签-->
                  <!--                  输入文本框-->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <!--                  添加按钮-->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!--              索引列-->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="属性名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button @click="showEditDialog(scope.row.attr_id)" size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                  <el-button @click="removeParams(scope.row.attr_id)" size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
        </el-tabs>
      </el-card>
<!--      添加参数/静态属性对话框-->
      <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisiable"
        width="50%"
        @close="addDialogClosed">
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="addDialogVisiable = false">取 消</el-button>
          <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
      </el-dialog>
<!--      修改参数对话框-->
      <el-dialog
        :title="'修改' + titleText"
        :visible.sync="editDialogVisiable"
        width="50%"
        @close="editDialogClosed">
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="editDialogVisiable = false">取 消</el-button>
          <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
      </el-dialog>
    </div>
</template>

<script>
export default {
  name: 'Params',
  data () {
    return {
      // 商品分类列表
      catalist: [],
      // 级联选择框配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态参数数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisiable: false,
      // 添加表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制修改对话框的显示隐藏
      editDialogVisiable: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.catalist = res.data
      console.log(this.catalist)
    },
    // 级联选择框选中项变化 会触发这个函数
    handleChange () {
      this.getParamsDate()
    },
    // tab页签点击事件
    handleClick () {
      console.log(this.activeName)
      this.getParamsDate()
    },
    // 获取参数的列表数据
    async getParamsDate () {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return false
      }
      console.log(this.selectedCateKeys)
      // 根据所选分类的id和当前所属的面板 获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.catedId}/attributes`, {
        params: {
          sel: this.activeName
        }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      console.log(res.data)
      // 分割字符串 分割成数组
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框的输入的值
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听对话框关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮 添加参数
    addParams () {
      // 表单预验证
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.post(`categories/${this.catedId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功')
        this.addDialogVisiable = false
        this.getParamsDate()
      })
    },
    // 点击按钮 展示修改对话框
    async showEditDialog (attrid) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.catedId}/attributes/${attrid}`, {
        params: { attr_sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败')
      }
      this.editForm = res.data
      this.editDialogVisiable = true
    },
    // 重置修改的表单
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮 修改参数信息
    editParams () {
      this.$refs.editFormRef.validate(async vaild => {
        if (!vaild) return false
        const { data: res } = await this.$http.put(`categories/${this.catedId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        console.log(this.editForm.attr)
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改成功')
        this.getParamsDate()
        this.editDialogVisiable = false
      })
    },
    // 根据id删除参数项
    async removeParams (attrid) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(`categories/${this.catedId}/attributes/${attrid}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功')
      this.getParamsDate()
    },
    // 文本框失去焦点或按下enter都会触发
    handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return false
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 发起请求 保存这次操作
      this.saveAttrVals(row)
    },
    // 点击按钮显示文本框
    showInput (row) {
      row.inputVisible = true
      // $nextTick就是当页面上元素被重新渲染之后 才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose (i, row) {
      row.attr_vals.splice(i, i)
      this.saveAttrVals(row)
    },
    async saveAttrVals (row) {
      const { data: res } = await this.$http.put(`categories/${this.catedId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功')
    }
  },
  computed: {
    // 如果按钮需要被禁用 则返回true
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的id
    catedId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style scoped lang="less">
.cat_opt{
  margin: 15px 0;
}
  .el-tag{
    margin: 10px;
  }
  .input-new-tag{
    width: 120px;
  }
</style>
